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Long-Term Debt - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended
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Jun. 12, 2008 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jan. 09, 2012 Sun Trust Term Loan | Dec. 31, 2012 Sun Trust Term Loan | Jan. 09, 2012 JPM Bridge Facility | Jan. 09, 2012 JPMorgan Chase Bank, N.A. | Jan. 09, 2012 Sun Trust Revolver | Dec. 31, 2012 Sun Trust Revolver | Dec. 31, 2012 JPM Term Loan | Dec. 31, 2012 Private Placement | Dec. 31, 2011 Private Placement | Dec. 31, 2012 Private Placement Series A | Dec. 31, 2012 Private Placement Series B | Dec. 31, 2012 Private Placement SeniorNotes | Oct. 12, 2012 New Master Agreement Y | Dec. 31, 2012 New Master Agreement | Jun. 12, 2008 Line of Credit | Dec. 31, 2012 Line of Credit | Dec. 31, 2012 Line of Credit Sun Trust Revolver | Dec. 31, 2012 Master Agreement Y | Dec. 31, 2011 Master Agreement | Dec. 31, 2012 Master Agreement Series C | Dec. 31, 2012 Master Agreement Series D | Dec. 31, 2012 Master Agreement Series E | Dec. 31, 2012 Libor
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes outstanding |  | $ 450,000,000 | $ 250,000,000 |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 200,000,000 |  | $ 0 |  |  |  | $ 150,000,000 | $ 150,000,000 | $ 25,000,000 | $ 25,000,000 | $ 100,000,000 |
Debt instrument, issuance date |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 15, 2004 | Jul. 15, 2004 |  |  |  |  |  |  |  |  | Dec. 22, 2006 | Feb. 01, 2008 | Sep. 15, 2011 |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.57% | 6.08% |  |  |  |  |  |  |  |  | 5.66% | 5.37% | 4.50% |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 15, 2011 | Jul. 15, 2014 |  |  |  |  |  | Dec. 31, 2016 |  |  | Dec. 22, 2016 | Jan. 15, 2015 | Sep. 15, 2018 |
Notes redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum shelf facility capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |  | 200,000,000 |  |  |  |  |
Length of the issuance period of long-term debt (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  | 3 |  |  |  |  |
Long-term debt maturity, period length, maximum (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Maturity dates, not to exceed ten years |  |  |  |  | Maturity dates, not to exceed ten years |  |  |  |  |
Lending commitment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |
Potential maximum increase in lending commitment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |
Revolving credit facility in the maximum principal amount |  |  |  |  |  | 150,000,000 |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |  |  |  |  |
Reduction in maximum principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |
Revolving credit facility, extended maturity date | Jun. 03, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving and term loan |  |  |  |  | 100,000,000 |  | 50,000,000 | 50,000,000 | 50,000,000 |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in revolving credit facility |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit usage fee, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Letter of credit usage fee, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.40% |  |  |  |  |  |  |
LIBOR below base rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Availability fees, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.175% |  |  |  |  |  |  |
Availability fees, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |
Interest rate, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Interest rate, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.40% |  |  |  |  |  |  |
Adjusted LIBOR Rate |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
30-day LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.23%
30-day Adjusted LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25%
Interest paid |  | 16,090,000 | 15,571,000 | 14,491,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long term debt 2013 |  | 93,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long term debt 2014 |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long term debt 2015 |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long term debt 2016 |  | 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long term debt 2017 and beyond |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long term debt 2018 and beyond |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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